Eaton JG3250A12S43 Engine Generator MCCB - 14 kAIC
Part Number: JG3250A12S43
Quick Summary
The engine generator molded case circuit breaker protects generator-driven power systems in industrial plants. Facing downtime, surges, and escalating maintenance costs, engineers need protection that trips precisely when needed without interrupting critical loads. Certifications including UL 489, IEC 947-2, and CSA, along with UL Listed E7819 and MIL-DTL-17361 compatibility, underscore reliability in harsh environments. Designed for seamless integration with J-frame protectors and 60 Hz generator sets, it supports reverse feed and a shunt-trip option on the opposite side, delivering safe, compliant standby power with faster corrective actions and improved uptime.
Product Information
Extended Description
JG3250A12S43 Eaton: Eaton Series C complete EG molded case circuit breaker, J-frame, Thermal-magnetic trip, 250A, Three-pole, 250A, 600 Vac, 14 kAIC at 480 Vac, 2A-2B same side w/right pigtail, 12-24 Vac opposite side w/ left pigtail, Reverse feed, 60 Hz
Product Name
Eaton complete engine generator molded case circuit breaker
Catalog Number
JG3250A12S43
UPC
786676021449
Product Length/Depth
12.125 in
Product Height
6.75 in
Product Width
6.75 in
Product Weight
9.7 lb
Warranty
Eaton Selling Policy 25-000, one (1) year from the date of installation of the Product or eighteen (18) months from the date of shipment of the Product, whichever occurs first.
Compliances
MIL-DTL-17361
Certifications
UL 489 IEC 947-2 UL Listed file E7819 CSA Std. C22.2 No. 5 QPL17361
Type
Engine generator
Amperage Rating
250 A
Voltage rating
600 Vac
Trip Type
T268
Circuit breaker frame type
Complete breaker
Auxiliary switch
2A-2B same side with right pigtail
Shunt trip
12-24V left pigtail opposite
Terminals
Line and load
Frame
J
Frequency rating
60 Hz
Class
Engine generator
Interrupt rating
14 kAIC at 480 Vac
Generator rating
90 kVA/72 kW at 240 Vac, 181 kVA/144 kW at 480 Vac, 226 kVA/181 kW at 600 Vac
Number of poles
Three-pole
Trip rating
250 A
Functions
Reverse
Engine generator circuit breakers catalog
Circuit Breakers Explained
Eaton Specification Sheet - JG3250A12S43
High-current protection with precise thermal-magnetic trip delivers robust generator protection for standby and emergency power systems, reducing nuisance trips and safeguarding critical loads. Business impact: improved uptime and lower maintenance costs; application: industrial facilities, data centers, and manufacturing lines needing reliable 250 A protection at 600 Vac. The T268 trip characteristic coordinates with generator dynamics to minimize arc energy during faults, enabling safer shutdowns and smoother restoration after faults. This unit includes a right-side 2A-2B auxiliary switch and a left-side 12-24 V shunt trip, offering remote signaling and fast disengagement for personnel safety; application: remotely controlled protection in plant-wide safety schemes. Compatibility with line and load terminals, three-pole framing (J frame), and 60 Hz operation simplifies installation and reduces wiring errors; business impact: faster commissioning and reduced field rework, especially when retrofitting existing generator sets. The reverse feed capability and 60 Hz specification expand installation options in complex layouts, while maintaining strict protection against overcurrent and short-circuit events; application: generator rooms with constrained layouts. Rigorous compliance with MIL-DTL-17361 and UL/IEC/CSA certifications assures performance in harsh environments, protecting investments in generator sets and switchgear. Generator ratings up to 90 kVA/72 kW at 240 Vac, 181 kVA/144 kW at 480 Vac, and 226 kVA/181 kW at 600 Vac deliver scalable protection for a range of industrial gensets; business impact: supports future capacity and budget planning.
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FAQs
JG3250A12S43 is a three-pole J-frame molded case circuit breaker designed for line and load terminals. It supports standard installation with right-side auxiliary and left-side shunt trip options. Its compact 6.75 in width/height and 12.125 in depth fit typical generator rooms and switchgear enclosures, reducing retrofit complexity while preserving full protection and control capabilities.
The unit is rated for 250 A, 600 Vac, with a thermal-magnetic trip configured as T268. It provides 14 kAIC at 480 Vac, supporting rapid fault interruption in generator-driven circuits. With a 60 Hz frequency rating, it aligns with standard North American generator sets and helps ensure coordinated protection with other protective devices in the same bus.
Yes. Its high current rating, rugged MIL-DTL-17361 compatibility, and UL/CSA certifications make it suitable for standby and emergency power applications. The device’s reverse feed capability and shunt trip option enable remote safety interlocks and fast disconnection, which are essential for maintaining uptime and protecting critical loads in data centers and manufacturing facilities.
JG3250A12S43 complies with UL 489, IEC 947-2, and CSA C22.2 No. 5, with UL listing E7819 and MIL-DTL-17361 compatibility. These certifications confirm electrical safety, reliability in industrial environments, and compliance for defense and aerospace-grade applications, reducing compliance risks in regulated industries.
The product ships with Eaton’s standard warranty policy, including one year from installation or 18 months from shipment, whichever occurs first. For maintenance, recommended inspection intervals align with standard MCCB practices, and Eaton provides specification sheets and catalogs to assist with field service and spares planning.